From 9294d2604049d79eed198f9f3de5b4f805e4b964 Mon Sep 17 00:00:00 2001
From: syeopite <syeopite@syeopite.dev>
Date: Fri, 1 Sep 2023 11:09:58 -0700
Subject: [PATCH] Add stats-based /videoplayback blockage status

---
 src/invidious/helpers/helpers.cr             | 17 +++++++++++++++++
 src/invidious/jobs/statistics_refresh_job.cr | 10 ++++++++++
 src/invidious/routes/api/v1/misc.cr          | 16 ++++++++++++++++
 src/invidious/routes/video_playback.cr       |  5 +++++
 4 files changed, 48 insertions(+)

diff --git a/src/invidious/helpers/helpers.cr b/src/invidious/helpers/helpers.cr
index 23ff0da9..38b96db7 100644
--- a/src/invidious/helpers/helpers.cr
+++ b/src/invidious/helpers/helpers.cr
@@ -208,3 +208,20 @@ def proxy_file(response, env)
     IO.copy response.body_io, env.response
   end
 end
+
+# Fetch the playback requests tracker from the statistics endpoint.
+#
+# Creates a new tracker when unavailable.
+def get_playback_statistic
+  if (tracker = Invidious::Jobs::StatisticsRefreshJob::STATISTICS["playback"]) && tracker.as(Hash).empty?
+    tracker = {
+      "totalRequests"      => 0_i64,
+      "successfulRequests" => 0_i64,
+      "ratio"              => 0_f64,
+    }
+
+    Invidious::Jobs::StatisticsRefreshJob::STATISTICS["playback"] = tracker
+  end
+
+  return tracker
+end
diff --git a/src/invidious/jobs/statistics_refresh_job.cr b/src/invidious/jobs/statistics_refresh_job.cr
index a113bd77..4d3cb017 100644
--- a/src/invidious/jobs/statistics_refresh_job.cr
+++ b/src/invidious/jobs/statistics_refresh_job.cr
@@ -18,6 +18,13 @@ class Invidious::Jobs::StatisticsRefreshJob < Invidious::Jobs::BaseJob
       "updatedAt"              => Time.utc.to_unix,
       "lastChannelRefreshedAt" => 0_i64,
     },
+
+    #
+    #    "totalRequests" => 0_i64,
+    #    "successfulRequests" => 0_i64
+    #    "ratio"   => 0_i64
+    #
+    "playback" => {} of String => Int64 | Float64,
   }
 
   private getter db : DB::Database
@@ -56,5 +63,8 @@ class Invidious::Jobs::StatisticsRefreshJob < Invidious::Jobs::BaseJob
       "updatedAt"              => Time.utc.to_unix,
       "lastChannelRefreshedAt" => Invidious::Database::Statistics.channel_last_update.try &.to_unix || 0_i64,
     }
+
+    # Reset playback requests tracker
+    STATISTICS["playback"] = {} of String => Int64 | Float64
   end
 end
diff --git a/src/invidious/routes/api/v1/misc.cr b/src/invidious/routes/api/v1/misc.cr
index e499f4d6..16fc229d 100644
--- a/src/invidious/routes/api/v1/misc.cr
+++ b/src/invidious/routes/api/v1/misc.cr
@@ -6,6 +6,22 @@ module Invidious::Routes::API::V1::Misc
     if !CONFIG.statistics_enabled
       return {"software" => SOFTWARE}.to_json
     else
+      # Calculate playback success rate
+      if (tracker = Invidious::Jobs::StatisticsRefreshJob::STATISTICS["playback"]?)
+        tracker = tracker.as(Hash(String, Int64 | Float64))
+
+        if !tracker.empty?
+          total_requests = tracker["totalRequests"]
+          success_count = tracker["successfulRequests"]
+
+          if total_requests.zero?
+            tracker["ratio"] = 1_i64
+          else
+            tracker["ratio"] = (success_count / (total_requests)).round(2)
+          end
+        end
+      end
+
       return Invidious::Jobs::StatisticsRefreshJob::STATISTICS.to_json
     end
   end
diff --git a/src/invidious/routes/video_playback.cr b/src/invidious/routes/video_playback.cr
index 9641e01a..d1ac5d9e 100644
--- a/src/invidious/routes/video_playback.cr
+++ b/src/invidious/routes/video_playback.cr
@@ -80,9 +80,14 @@ module Invidious::Routes::VideoPlayback
     # Remove the Range header added previously.
     headers.delete("Range") if range_header.nil?
 
+    playback_statistics = get_playback_statistic().as(Hash(String, Int64 | Float64))
+    playback_statistics["totalRequests"] += 1
+
     if response.status_code >= 400
       env.response.content_type = "text/plain"
       haltf env, response.status_code
+    else
+      playback_statistics["successfulRequests"] += 1
     end
 
     if url.includes? "&file=seg.ts"